<template>
  <!-- eslint-disable -->
  <div>
     <!-- 面包屑导航区 -->
     <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>     
    </el-breadcrumb>


    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区 -->
      <el-alert
      title="添加商品信息"
      type="info"
      center :closable="false"
      show-icon>
    </el-alert>
    <!-- 步骤条区 -->
    <el-steps  align-center :space="300" :active="activeIndex - 0" finish-status="success">
      <el-step title="基本信息"></el-step>
      <el-step title="商品参数"></el-step>
      <el-step title="商品属性"></el-step>
      <el-step title="商品图片"></el-step>
      <el-step title="商品内容"></el-step>
      <el-step title="完成"></el-step>
    </el-steps>
    

    <!-- tab栏区域 -->
    <el-form  :model="addForm" :rules="addFormRules" 
    ref="addFormRef" label-position="top"
    label-width="100px" >
    <el-tabs @tab-click="tabClicked" :before-leave="beforeTabLeave" v-model="activeIndex" :tab-position="'left'" >
      <el-tab-pane label="基本信息" name="0">
        <el-form-item label="商品名称" prop="goods_name">
          <el-input v-model="addForm.goods_name"></el-input>
        </el-form-item>
        <el-form-item label="商品价格" prop="goods_price">
          <el-input v-model="addForm.goods_price" type="number"></el-input>
        </el-form-item>
         <el-form-item label="商品重量" prop="goods_weight">
          <el-input v-model="addForm.goods_weight"  type="number"></el-input>
        </el-form-item> 
        <el-form-item label="商品数量" prop="goods_number">
          <el-input v-model="addForm.goods_number"  type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品分类" prop="goods_cat">
          <el-cascader
          v-model="addForm.goods_cat"
          :options="catelist"
          :props="cateProps"
          @change="handleChange"></el-cascader>
        </el-form-item>
      </el-tab-pane>
      <el-tab-pane  label="商品参数" name="1">
        <!-- 渲染表单的item项 -->
        <el-form-item v-for="item in manyTableData" 
        :key="item.attr_id" :label='item.attr_name'>
        <!-- 复选框组 -->
        <el-checkbox-group v-model="item.attr_vals">
          <el-checkbox border :label="cb" :key="i"
           v-for="(cb,i) in item.attr_vals"></el-checkbox>
        </el-checkbox-group>
      </el-form-item>
      </el-tab-pane>
      <el-tab-pane label="商品属性" name="2">
        <el-form-item :label="item.attr_name" :key="item.attr_id"
        v-for="item in onlyTableData">
        <el-input v-model="item.attr_vals"></el-input>
      </el-form-item>
      </el-tab-pane>
      <el-tab-pane label="商品图片" name="3">
        <!-- action 表示图片要上传的后台API接口地址 -->
        <el-upload 
        :headers="headerObj" :on-success="handleSuccess"     
        action="http://127.0.0.1:8888/api/private/v1/upload"
        :on-preview="handlePreview"
        :on-remove="handleRemove"
        list-type="picture">
        <el-button size="small" type="primary">点击上传</el-button>
        <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
      </el-upload>
      </el-tab-pane>
      <el-tab-pane label="商品内容" name="4">
        <!-- 富文本编辑器 -->
        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
        <!-- 添加商品的按钮 -->
        <el-button @click="add" type="primary" class="btnAdd">添加商品</el-button>
      </el-tab-pane>
    </el-tabs>
    </el-form>
  
  </el-card>

  <!-- 图片预览 -->
  <el-dialog
  title="图片预览"
  :visible.sync="previewVisible"
  width="50%">
  <img :src="previewPath" alt="" class="previewImg">
</el-dialog>
  </div>
</template>


<script>
    import _ from 'lodash'
    export default {
        data() {
            return {
                activeIndex: '0',
                // 添加商品的表单数据对象
                addForm: {
                    goods_name: '',
                    goods_price: 0,
                    goods_weight: 0,
                    goods_number: 0,
                    // 商品所属的分类数组
                    goods_cat: [],
                    // 图片的数组
                    pics: [],
                    // 商品的详情描述
                    goods_introduce: '',
                    attrs: []
                },
                // 
                addFormRules: {
                    goods_name: [{
                        required: true,
                        message: '请输入商品名称',
                        trigger: 'blur'
                    }],
                    goods_price: [{
                        required: true,
                        message: '请输入商品价格',
                        trigger: 'blur'
                    }],
                    goods_weight: [{
                        required: true,
                        message: '请输入商品重量',
                        trigger: 'blur'
                    }],
                    goods_number: [{
                        required: true,
                        message: '请输入商品重量',
                        trigger: 'blur'
                    }],
                    goods_cat: [{
                        required: true,
                        message: '请选择商品分类',
                        trigger: 'blur'
                    }],
                },
                // 商品分类列表
                catelist: [],
                cateProps: {
                    expandTrigger: 'hover',
                    label: 'cat_name',
                    value: 'cat_id',
                    children: 'children'
                },
                // 动态参数列表数据
                manyTableData: [

                ],
                // 静态属性列表数据
                onlyTableData: [],
                // 图片上传组件headers请求头对象
                headerObj: {
                    Authorization: window.sessionStorage.getItem('token')
                },
                // 预览地址
                previewPath: '',
                // 预览对话框的显示与隐藏
                previewVisible: false
            }
        },
        created() {
            this.getCateList()
        },
        methods: {
            // 获取所有商品分类数据
            async getCateList() {
                const {
                    data: res
                } = await this.$http.get("categories")
                if (res.meta.status != 200) {
                    return this.$message.error("获取商品分类数据失败")
                }
                this.catelist = res.data
                console.log(this.catelist);
            },
            // 级联选择器选中项变化触发
            handleChange() {
                console.log(this.addForm.goods_cat);
                if (this.addForm.goods_cat.length != 3) {
                    this.addForm.goods_cat = []
                }
            },
            beforeTabLeave(activeName, oldActiveName) {
                // console.log('即将离开的标签页名称是:' + oldActiveName);
                // console.log('即将进入的标签页名称是:' + activeName);
                if (oldActiveName == '0' &&
                    this.addForm.goods_cat.length != 3) {
                    this.$message.error("请先选择商品分类")
                    return false
                }
            },
            async tabClicked() {
                // console.log(this.activeIndex);
                if (this.activeIndex == '1') {
                    // 证明访问的是动态参数面板
                    const {
                        data: res
                    } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: {
                            sel: 'many'
                        }
                    })
                    if (res.meta.status != 200) {
                        return this.$message.error("获取动态参数失败")
                    }
                    console.log(res.data);
                    res.data.forEach(item => {
                        item.attr_vals =
                            item.attr_vals.length == 0 ? [] :
                            item.attr_vals.split(' ')
                    })

                    this.manyTableData = res.data
                } else if (this.activeIndex == '2') {
                    const {
                        data: res
                    } = await this.$http.get(`categories/${this.cateId}/attributes`, {
                        params: {
                            sel: 'only'
                        }
                    })
                    if (res.meta.status != 200) {
                        return this.$message.error("获取静态属性失败")
                    }
                    console.log(res.data);
                    this.onlyTableData = res.data
                }
            },
            // 处理图片预览效果
            handlePreview(file) {
                console.log(file);
                this.previewPath = file.response.data.url
                this.previewVisible = true
            },
            // 处理移除图片的操作
            handleRemove(file) {
                console.log(file);
                // 1.获取将要删除的图片的临时路径
                const filePath = file.response.data.tmp_path;
                // 2.从pics 数组中,找到这个图片的对应的索引值
                const i = this.addForm.pics.findIndex(x => x.pic == filePath);
                // 3.调用数组的splice方法,把图片信息对象,从pics数组中移除
                this.addForm.pics.splice(i, 1)
                console.log(this.addForm);

            },
            // 监听图片上传成功的事件
            handleSuccess(response) {
                console.log(response);
                // 1.先拼接得到一个图片信息对象
                const picInfo = {
                        pic: response.data.tmp_path
                    }
                    // 2.将图片对象信息push到pics数组中
                this.addForm.pics.push(picInfo)
                console.log(this.addForm);
            },
            // 添加商品
            add() {
                // console.log(this.addForm);
                this.$refs.addFormRef.validate(async valid => {
                    if (!valid) {
                        return this.$message.error("请填写必要的表单项")
                    }
                    // 执行添加的业务逻辑
                    // lodash cloneDeep(obj)
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat =
                        form.goods_cat.join(",");
                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals.join(" ")
                        }
                        this.addForm.attrs.push(newInfo)
                    });
                    //静态属性
                    this.onlyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs
                    console.log(form);

                    // 发送请求,添加商品
                    // 商品名称必须是唯一的
                    const {
                        data: res
                    } = await this.$http.post("goods", form)
                    if (res.meta.status != 201) {
                        return this.$message.error("添加商品失败")
                    }
                    this.$message.success("添加商品成功")
                    this.$router.push("/goods")
                })
            }
        },
        computed: {
            cateId() {
                if (this.addForm.goods_cat.length == 3) {
                    return this.addForm.goods_cat[2]
                }
                return null
            }
        },
    }
</script>

<style lang="less" scoped>
    .el-checkbox {
        margin: 0 10px 0 0 !important;
    }
    
    .previewImg {
        width: 100%;
    }
    
    .btnAdd {
        margin-top: 20px;
    }
</style>